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Tueftler

Highly accurate I2C clock and calender module [150101]

Status: Finished
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November 23, 2014
WP_20141123_12_20_33_Pro.jpg

This is an highly accurate clock & calender module as a Break-out Board (BoB). I use an RV3029-C2. C2 is a 5 mm SMD. The design is very simple. The PCB is 30 x 25 mm. It is based on an idea from Elektor 10/2014 page 57. In my case I have a backup battery. CLKOUT is used. My plan is to improve my project Humidity-controlled basement ventilation system. So I need an I2C bus and an interrupt signal with 1 Hz to poll the time. Here I use CLKOUT. The battery should last for ten years.

Update 11.07.2015
More than a half year up and running.... the accuracy is like a radio-controlled watch! Very good!

Note
If you test this RTC with my project UART to I2C Converter via Attiny2313A please remove the 24C16 EEPROM because both (Clock and EEPROM) use the same I2C address.

 

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